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(No Model.) I 2 Sheets-Sheet 1.

R. SOHEFBAUER.

ELECTRIC ARC LAMP. No. 546,828. Patented Sept. 24, 1895.

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(No Model.) 2 Sheets-Sheet 2.

R. SGHEPBAUER.

ELECTRIC ARG LAMP.

No. 646,828. Patented Sept. 24, 1895-.

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RUPERT SCHEFBAUER, OF PATERSON, NEW JERSEY, ASSIGNOR TO THE AUERBAOH-IVOOLVERTON ELECTRIC COMPANY, OF NEW YORK, N. Y.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 546,828, dated September 24, 1895.

Application filed March 5, 1895 To all whom, it may concern:

Be it known that I, RUPERT SCHEFBAUER, a citizen of the United States, residing at Paterson, in the county of Passaic and State of New Jersey, have invented an Improvement in Arc Lamps, of which the following is a speci-' fication.

In this lamp I make use of a helix in the main-line circuit to the carbons and a highresistance helix in a shunt, and a contact-pre serving switch between the binding-posts, so that the attendant can effectuallyturn off the current from the lamp without disturbing any other lamps on the circuit, and I use a circuitcloser that is brought into action if either carbon breaks to close the circuit through the lamp until the arc is again restored between the carbons, and I use a mechanical switch that closes the circuit automatically when the carbons are burned out and brings into the main line a resistance equal, or nearly so, to the resistance of the arc, so as not to interfere with other lamps in the circuit when the particular one ceases to be operating, and I make use of a starting-magnet in a shuntcircuit containing the resistance and which normally remains closed when the lamp is out of action, and which circuit is broken when the current passes through the carbons.

In the drawings, Figure 1 is a general elevation of the lamp with the inclosing-case partially in section. Fig. 2 is a plan view below the line a: as. Fig. 3 is a diagram of the circuit connections, and Fig. 4 is a section of the rheostat.

The top plate A and bottom plate 13 are connected by the columns 0, and it is advantageous to provide a surrounding case D, and the central connection E is provided'for sus-' taining the lamp in any desired manner,and there is a base-plate F for the circuit-preserving switch G, which circuit-preserving switch G is made with pivots et to the binding-posts 5 and 6, and there are two bars 7 and 8 permanentlyconnected together by an insulatingblock 9, so that the bars 7. and 8 can be rocked by a lever-handle 10, applied to one of the pivots 4, and there are insulated spring-contacts 11, 12, and 13 upon the base-plate F, and these spring-contacts are preferably divided Serial No. 40,605- (No model.)

into vertical tongues, and the spring-contact 13 is made double, so that when the bars 7 and 8 are in contact therewith the current passes directly through such bars 7 and 8 and the'contact 13 from the and binding-posts, and when the levers 7 and 8 are turned down horizontally the circuits remain closed, and then the circuit between the and binding-posts is broken by separating the bars 7 and 8 from the contact 13 and allowing such bars 7 and S to remain in contact with the springs 11 and 12 only, as seen in Fig. 1. Hence the circuit will in this condition be closed through the lamp, there being connections from the contacts 11 and 12 to the different parts of the lamp, as illustrated in Fig. 3.

The main helix II and the starting-magnet K are advantageously in line with each other, so that the cores 14; of such magnets can be connected together, as shown in Fig. 1, and the helix I is a fine wire and in a shunt, and the core 15 of the same is connected to one end of the lever M, and the cores 14 are connected to the other end of such lever M, and there is preferably a dash-pot at N, connected with the lever to prevent sudden movements of the parts.

The carbon-holders O and P are pivoted at 16 and preferably insulated, the circuit-wires being connected directly to such carbon-holders, and the carbons are represented at O and P, and there are segmental racks connected with the respective carbon-holders and acted upon by pinions upon the shaft 6, and this shaft 6 also forms the pivot for the rockingframe Q, towhich the lever M is connected, and there is atrain of gearing and a fly-wheel R and a spring-stop S for the same, substantially the same as in my application, Serial No. 528,966, and the spring which is connected with the train of gearing is wound up by the separation of the carbon-holders O and P for the insertion of the carbons, and the fly-wheel R is allowed to revolve as the carbons are brought toward each other by the action of the spring and pinions.

I provide a rheostat T, preferably in the form of a coil of German-silver wire, containing a core of asbestos or asbestos paper, as illustrated in section, Fig. 4, and the ends of this rheostat are in a circuit connection with the spring U, adjacent to which is a tumbler V that is acted upon by a pin 18 upon one of the carbon-holding arms, such pin passing intoa notchto turn the tumbler in either one direction or the other, and when this tumbler is turned by the carbonholding arms approaching each other the spring U closes the circuit upon the stop 19, and when the carbon-holding arms are separated and the tumbler U turned in the opposite direction, the spring U is separated from the stop 19 to break the circuit. This tumbler may be of any desired character, but it is advantage ously made as a disk, with a notch in one side for the pin and with two sides flattened, one flat part being more distant from the center of the tumbler than the other, so as to hold the spring away from the stop in one position or to allow the spring to close against thostop in the other position, as illustrated in Figs. 1 and 3.

The cut-out magnet L has an armature 20, which is normally held out of contact with the circuit-closer21,and when the current through the cut-out magnet L is broken the armature 20, dropping, closes the circuit with 21.

Referring now to Fig. 3, the circuits and two operations of the lamp will be apparent. From the spring-contact 12 wires branch to the cut-out magnet L, the shunt-magnet I, and the rheostat T, and from the spring-contact 11 the wires branch to the main-line helix H and the stop 19 and the main helix ll isin the circuit passing to the carbon 0, and there is a wire connecting the carbon 1 with the he lix of the cut-out magnet L.

lVhen the lamp is in operation the current passes from 12 through L I" O H to 11, and the line-wire helix I is in a shunt between 12 and II. Hence the circuit through I is maintained, and the are is drawn by the action of the shunt-magnet I and main-line magnet ll acting upon the lever M to turn the same and the rocking-frame and act upon the pinions and carbon-holders to draw and regulate the are between the carbons. It, now, a carbon breaks, the circuit through the cut out magnet L is broken and the armatur 20 drops away, instantly closing the circuit at2l, so that the current passes from 12 through the resistance T and the starting-magnet K to 21, and by the armature 20 and connection therefrom to the spring-contact 11, thus throwing into the main line the resistance T, corresponding, or nearly so, to the resistance of the electric are. As soon as the carbons come together or the arc is restored, the current passing through L attracts tho armature, breaking the circuit between 20 and 21 and causing all the current to pass through the carbons instead of through the resistance '1, and the current passing through the helix K during the time that the current is broken at the carbons causes the same to act upon the lever M to prepare the parts for drawingthe arcby themain-line helix ceases H assoon as the current is rcstoredbetwecn the carbons, the main-line and shunt helix acting in the usual manner in drawing such are. As the carbons burn out and the carbon-holders approach each other, and the tumbler'V is turned by the pin 18, as aforesaid, the spring U closes the circuit through the rhcostat 'l and cuts out all other parts of the lamp by short-circuiting the current, and the parts re main in this condition until the carbon-hold ers are separated and fresh carbons introduced.

In consequence of the spring U being operated mechanically when the carbon-holder moves to the predetermined point, the current is diverted from the carbons through such spring U and the electromagnots become inoperative and do not tend to again draw the are. Hence there is no risk of injury to the lamp in consequence of a very high resistance in the are between the carbons, and the light is instantly extinguished and so remains as soon as the mechanical circuit-closer U 'V comes into action.

I claim as my invention-- 1. The combination with the carbon holt'lcra in an electric arc lamp and the main line circuit passing through the same, oi? two l1clices in said mainline circuit, and mechanism acted upon by one of said helices to draw the are and an armature cut out acted upon by the other helix to break a shunt circuit be tween the binding posts when the current; is passing through the carbons and to close such shunt circuit when the current ceases to pass through the carbons, an electro-magnct and a resistance in said shunt circuit, such elcctromagnet acting to move the carbons toward each other, substantially as specified.

2. The combination in an electric arc lamp with the carbon holders and main line circuit passing through the carbons, of a magnet in said main line circuit, a lever acted upon by the same for drawing the are, a rheostat and spring circuit closer in a shunt around the lamps, a fixed pivot and a tumbler with llat places for the spring to bear against, a pro jection on the carbon holder for automatically moving the tumbler to close the circuit to the rheostat when the carbons are burned out or to break such circuit when fresh carbons are inserted, substantially as set forth.

3. The combination with the carbon holders in an electric arc lamp and the main line circuit passing through the same, of two helices in said main line circuit, and mechanism acted upon by one of said helices to draw the are, and an armature cut out acted upon by the other helix to break a shunt circuit between the binding posts when the current is passing through the carbons and to close such shunt circuit when the current ceases to pass through the carbons, an electric-magnet and a resistance in said shunt circuit such electro-magnet acting to move the carbons toward each other, a helix of high resistance in a shunt between the binding posts and a lever ITG acted upon by suohhelix to feed the carbons, substantially as set forth.

4. The combination in an electric arc lamp, of a rheostat and a circuit closing spring in a shunt between the binding posts, a main line helix and cut out helix in the circuit passing through the carbons, a line wire helix in a shunt of the main circuit and mechanism actuated thereby for feeding the carbons, an armature and cut out actuated by the out out helix, a starting magnet anti arheostat in the circuit leading to the out out, a spring circuit breaker and mechanism actuated by the carbon holders for opening the circuit breaker when fresh carbons are inserted, substantially as set forth.

5. The combination with the carbons and the main line circuit through the same, of two helices in such circuit in series with the carbons, mechanism acted upon by one of said helices to draw the are, a cut out acted upon by the other helix, a shunt circuit passing through the cut out and a rheostat therein, the out out closing the shunt circuit through he rheostat when the current is not passing through the carbons, substantially as specified.

6. The combination with the carbon holders in an electric arc lamp of a shunt circuit be tween the binding posts and a spring contained in such shunt, a pivot and a tumbler having flat places against which the spring rests and a projection moved by the carbon holder and acting to turn the tumbler and make or break the circuit through the spring, substantially as specified.

Signed by me this 1st day of March, 1805.

RUPERT SCHEFBAUER. Witnesses:

SE0. '1. PINCKNEY, S. T. HAVILAND. 

